Commutator brush



Jan. 1 25- 1,521,744

R. N. BAYLIS COMMUTATOR BRUSH Filed June 24, 1924 ATTORNEY S- Patented Jan. 6, 1925.

UNlTlIl) filTAiES PATENT QFFlCE.

ROBERT N. BAYLIS, 0F CALDVJ LL, NEW SSIGNGF, TO THE BAYLIS CO1?! PANY, OF BLOOMFIELD, IilE'W A C931 3;

"EON GE NEW JERSEY.

COM'MTJ'TATUR- Application filed June To all LU/L071], it may concern:

lie it known that 1, Roman; ii. lliirnrs, a citizen of the United States of America, residing at Caldwell, New Jersey, have invented a new and useful Gonnnutat-or Brush, of which the following is a specification.

irly invention relates to a new and useful improvement in a con'imutator brush of a certain type, which improvement results in greatly prolonging the life of such a brush. The particular brush to which my improvement relates is of the type shown and described in my former Patent No. L901, of September 12, 1893, in which patent will also be found a detailed description of the holder adapted to said brush.

In the accompanying drawings- Fig. 1 is a side elevation of my improved brush as it would appear in use, a brush holder and a portion of a commutator being conventionally shown;

Fig. 2 is a perspecti alone;

Fig. 3 alone.

or represents a blo'cl: of electrical conducting material, preferably carbon, which constitutes the commutator brush proper. l represents the body of the brush holder. f represents a stationary supporting pin or stud for said brush holder. 0 represents a presser arm which engages the upper or outer end of the brush a, for holding it in position against the face of the brush holder body Z) and for feeding the brush against the commutator d. Ordinarily, the arm 0 of the brush holder is impelled forwardly by means of a spring (not shown), such as fully described in my former patent and now well understood in the art.

In the particular form shown herein the brush supporting face of the holder body Z) is placed at an incline relatively to the surface of the commutator d, in a plane between the tangent and the radius of the commutator. This is, perhaps, the most common practice, although the particular angle of the brush supporting face relatively to the connnutator is not material. With the body 6 set as shown in Fig. 1, the inner contact end of the brush a would necessarily be formed at an appropriate angle to properly contact with the surface of the commutator (Z, as shown in Fig. 1. The upper or outer end of the brush a, in order to be ve view of the brush is a side elevation of the brush proper y held against the supporting face of the brush holder by the arm 0, has heretofore been formed on an incline or bevel extending from the front to the rear edge, as m y be seen by reference to Fig. 10 of my aforesaid patent. it is obvious that if this bevel at the outer id the brush a extends entirely across the block from the point. to the point 3/, as in my previous patent, the cilective life of the brush will end when it is worn down to the dotted line w, l have found that by cutting away only a portion of the outer end of the brush, so as to form an incline or bevel which extends partially across the same, as shown clearly in the drawings, 1 can ery materially add to the effective life of said brush, since it is apparent that the same may be continued in for a longer period than would otherwise be possible. For example, in a brush of the proportions indicated in the draning, by merely adding, so to speak, the conimall amount of material represented b the shaded area 6 in Fig. 3, the effective life of the brush would be practically doubled. This is apparent from an ex- (llllllliltli'lll of Fig. 1, wherein it will be seen that, if the brush were formed with the outer end beveled from .r to y, said brush would have to discarded when worn down to the line. w;I By my improvement the brush may be continued in use until it has worn down approximately to the line T have found that a partial incline or bevel the outer end of the brush is adequate to nable the spring arm to hold the brush 1 n proper contact wit-h the commutator surface, and also in proper contact with the the supporting face of the holder body I).

For convenience of description I will rein the. appended claims to that part of the brush indicated by the shaded area c in Fig. 3 as a bulge, which extends above the plane of the adjacent beveled portion, the presence of which bulge is responsible for the added life of the brush.

it will, of course, he understood that the invention relates not only to the improvein the brush as an article of manut ture, but also to the combination of said brush with a holder of the type illustrated.

I claim;

1. A commutator brush, consisting of an electric conducting block, the inner end of which adapted to contact with a comill) niutator, the outer end being beveled only partially across the same from the front to Ward the rear edge, said bevel being in a plane intersecting the plane of the inner 5 end of said brush, said brush having a brush having a bulge extending above the bulge extending above the plane of the parplane of said partial incline at said outer 15 tial bevel at the outer end. end.

A commutator brush, consisting of an electric conducting block, the inner end of ROBERT N. BAYLIS.

which is formed on an incline to contact 10 with a commutator, part of the outer end being formed on an opposite incline from the front toward the rear edge thereof, said 

